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Description and Specifications 1
3
89VP Instruction Manual Section 1: Description and specifications
PN 51-389VP January 2013
Features and Applications
389VP triple-junction sensors are now offered with SMART capabilities. SMART option becomes
enabled when use with the 1056, 1057, 1066, 56 instruments and on 6081P wireless transmitter. The
pH-loop capabilities include auto-recognition of the SMART sensor, automatic upload of calibration
data and associated time stamp, historical recording of pH diagnostics (slope, offset, reference imped-
ance, glass impedance). This trending data allows technicians to predict frequency of maintenance
and estimate sensor life for a particular process condition. Additional SMART features include factory
calibration, resetting SMART sensor calibration data with user menus without power cycling, and man-
ufacturing information.
The reference junction aids in the sensor’s resistance to poisoning ions and helps prolong sensor
life. 389VP sensors have a triple junction reference, which protects the reference element from poi-
soning ions — such as ammonia, chlorine, cyanides, and sulfides — in the process. Both models are
made with an outer ceramic junction constructed in an annular design around the pH/ORPsensitive
membrane.
The AccuGLASS™ pH glass formulations exceed industry standards. The AccuGlass pH glass is a
result of many years of glass research resulting in a formulation which has been found to increase the
life of the sensor. Unlike other pH glasses presently on the market, this glass resists cracking especially
at higher temperatures and reduces sodium ion error commonly found in high pH applications.
Overall, the AccuGlass formulation enhances the sensor performance to measure pH more accurately
and have a longer sensor life than ever before.
A choice of pH glass electrodes is available to best meet various application needs. Two types
are available: hemi bulb and high pH glass. The ACCUGLASS hemi bulb is the standard glass offered
on both models and can be used for most applications. The hemi bulb is also found on the high pH
glass option.
The 389VP is offered with a watertight sensor-tocable connector which eliminates re-wiring and
cable twisting when replacing sensors. The Variopol VP multiple pin connector is an integral part of
each sensor model and uses a mating VP cable. Once the cable is installed and wired to the analyzer,
sensors are easily replaced without replacing the cable and without rewiring the analyzer. Also the
cable can be disconnected from the sensor before removal from the process which eliminates cable
twisting. VP8 cable assembly works both with VP8 and VP6 sensor connector.
The 389VP has a molded Tefzel body with Viton o-rings, making each sensor very robust and
chemically resistant. Complete encapsulation eliminates leakage or high humidity problems tradi-
tionally found in other pH/ORP designs. The simplified construction, designed with user conven-
ience in mind does not require electrolyte (KCl) replenishment or any high maintenance trou-
bleshooting procedures.
NEW - SMART preamplifier is the standard option. A preamplifier converts the high impedance
pH signal into a stable, noise-free signal and must be used with all pH sensors. Our preamplifier
method has become the industry standard for pH/ORP measurement reliability.
The 389VP is a combination sensor (pH, reference, and temperature within sensor body) and
measures pH or ORP (Oxidation/Reduction Potential) of aqueous solutions in pipelines, open
Section 1: Description and Specifications
1.1